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I Sequoia an :los A Road San Carlos 0 23 960 (650)232 9600 FAXNO Analytical www quoial650) 329612 www soquoialatu tom Gettler-Ryan/Geostr8tegtes(1) Project Unocal(4) 6747 Sierra Court, Suite! Project Number Unocal SS#5098 Stockton CA Reported Dublin CA 94568 Project Manager Deanna Harding 01/41/02 11 05 -Total Purgeable Hydrocarbons,by DHS LUFT ._ _ _ _ Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-7(L]12030-08)Water Sampled 12/04/0108 53 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline: '_ND - - 50 ug/l _ 1 1120049 12/12/01 12112101` EPA 8015M _ Surrogate a,a,a-Trifluorotoluene 707% 60-140 " MW-8D(L)12030-09)Water Sampled 12/04/01 14 41 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline 6200 500 ug/1 10 1120050 12/12/01 12/12/01 EPA 8015M P-01 Surrogate a,a,a-Trifluorotoluene 969% 60-140 MW-9(L)12030-]0)Water Sampled 12/03/01 15 05 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline 58 50 ug/l 1 1120049 12/12/01 12/12/01 EPA 8015M P-01 Surrogate a,a,a-Trtfluorotoluene 821 % 60-140 " MW-lO(L112030-11)Water Sampled._1_2103/01 11 10 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline T ND - 50 ug/l 1 1120049 12/12/01 12/12/01 EPA 8015M - Surrogate aa a-Trifluorotoluene 845% 60-140 " MW-]OA (L112030-12)Water Sampled 12/03/01 11 45 Received 12/04/01 17 50 " Purgeable Hydrocarbons as Gasoline ND 50 ug/I 1 1120049 12/12/01 12/12/01 EPA 8015M Surrogate a,a,o-Trifluorotoluene 8.56% 60-140 " _MW-11 (L112030-13)Water Sampled 12/04/01 12 36 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline 14000 5000 ug/l 100 1120050 12/12/01 12/13/01 EPA 8015M P-01 Surrogate a,a a-TrJ7uorotoluene 85 8%--60:140 --MW-12 (L)12030-14)-Water—Sam pled12/04/01 08 58—Received 12/04101-17 50__ _ Purgeable Hydrocarbons as Gasoline_ T 1700 500 ugll 10 1120050 12/12/01 12/13/01 EPA 8015M P-01 Surrogate - a-Trtfluorotaluene __ T -— � �" 83-2°/a 60-140 Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain o custody document This analytical report must be reproduced in its entiret) Page 4 of 34